As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE RECEIVED AVNX MAU 2B FAIL CAUTION MESSAGE, THEN IT EXTINGUISHED. MESSAGE RE-APPEARED THREE TIMES AND DISAPPEARED, FINALLY STAYING ON. RAN QRH AND DECLARED AN EMERGENCY. LANDED FLAPS FULL WITH TRUCKS STANDING BY, NO ISSUES. AFTER LANDING RECEIVED FCND. CREW REPORTED BRAKES DID NOT FULL WORK ON TAXI IN. MAINTENANCE REMOVED AND REPLACED MAU 2 POWER SUPPLY.